Fresh information allegedly connecting the government of Saudi Arabia and the 9/11 terror attacks has been released.

Officials have revealed that the flight certificate of Al-Qaeda bomb maker Ghassan Al-Sharbi was discovered hidden in an envelope from the Saudi embassy in Washington when they arrested him in 2002.

Al-Sharbi is believed to have learned how to fly with the hijackers but did not take part in the attacks. Shortly before his arrest, he buried a bundle of documents, which is believed to have included the certificate.

The cache was discovered by US authorities and details, written in a memo known as Document 17 in 2003, were released without fanfare by investigators last year. They were only brought to the public’s attention when an activist discovered them and wrote about them on his website earlier this week.

The release has fuelled concerns the Saudi government may have been linked to the coordinated attacks, which killed nearly 3,000 people.

Activist Brian McGlinchey claimed the details would lead to people questioning the extent government individuals were involved, according to The Times.

He said: ‘The envelope points to the fundamental question hanging over us today: to what extent was the 9/11 plot facilitated by individuals at the highest levels of the Saudi government?’